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Note 11 - Stock Ownership Plans - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Jun. 28, 2020
USD ($)
$ / shares
shares
Outstanding, Shares (in shares) | shares 809
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.82
Exercised, Shares (in shares) | shares 0
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Cancelled, Shares (in shares) | shares (18)
Cancelled, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Outstanding, Shares (in shares) | shares 791
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.82
Outstanding, Weighted Average Remaining Contractual Term (Year) 1 year 1 month 6 days
Outstanding, Aggregate Intrinsic Value | $ $ 0
Exercisable, Shares (in shares) | shares 791
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.82
Exercisable, Weighted Average Remaining Contractual Term (Year) 1 year 1 month 6 days
Exercisable, Aggregate Intrinsic Value | $ $ 0